There are plenty of people who eat low-carb diets. Glycolysis isn't the only metabolic pathway to produce energy. Your argument seems based on the macronutrient

There are plenty of people who eat low-carb diets. Glycolysis isn't the only metabolic pathway to produce energy. Your argument seems based on the macronutrient, not its metabolites, particularly as you're focussing on the taste. If the taste were driven by the metabolites, starches would taste sweet as sugar. Sugar (and carbs) aren't intrinsically crucial as a macronutrient. They're calorically dense, which is important when calories are scarce. When calories are plentiful, their importance wanes.